1123455551 has 2 divisors, whose sum is σ = 1123455552. Its totient is φ = 1123455550.

The previous prime is 1123455533. The next prime is 1123455559. The reversal of 1123455551 is 1555543211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123455551 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123455559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561727775 + 561727776.

It is an arithmetic number, because the mean of its divisors is an integer number (561727776).

Almost surely, 2^1123455551 is an apocalyptic number.

1123455551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123455551 is an equidigital number, since it uses as much as digits as its factorization.

1123455551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15000, while the sum is 32.

The square root of 1123455551 is about 33517.9884688804. The cubic root of 1123455551 is about 1039.5657552848.

Adding to 1123455551 its reverse (1555543211), we get a palindrome (2678998762).

The spelling of 1123455551 in words is "one billion, one hundred twenty-three million, four hundred fifty-five thousand, five hundred fifty-one".